US7515422B2 - Electric power converter - Google Patents

Electric power converter Download PDF

Info

Publication number
US7515422B2
US7515422B2 US11/642,717 US64271706A US7515422B2 US 7515422 B2 US7515422 B2 US 7515422B2 US 64271706 A US64271706 A US 64271706A US 7515422 B2 US7515422 B2 US 7515422B2
Authority
US
United States
Prior art keywords
part
fin
cooling
electric power
power converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US11/642,717
Other versions
US20070279864A1 (en
Inventor
Masayuki Hirota
Satoshi Ibori
Tomoya Kamezawa
Jiangming Mao
Masahiro Hiraga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Industrial Equipment Systems Co Ltd
Original Assignee
Hitachi Industrial Equipment Systems Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2006150874A priority Critical patent/JP4848209B2/en
Priority to JP2006-150874 priority
Application filed by Hitachi Industrial Equipment Systems Co Ltd filed Critical Hitachi Industrial Equipment Systems Co Ltd
Assigned to HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO. LTD. reassignment HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO. LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IBORI, SATOSHI, HIRAGA, MASAHIRO, HIROTA, MASAYUKI, KAMEZAWA, TOMOYA, MAO, JIANGMING
Publication of US20070279864A1 publication Critical patent/US20070279864A1/en
Application granted granted Critical
Publication of US7515422B2 publication Critical patent/US7515422B2/en
Active legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/003Constructional details, e.g. physical layout, assembly, wiring, busbar connections
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/36Means for starting or stopping converters
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/20Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20909Forced ventilation, e.g. on heat dissipaters coupled to components
    • H05K7/20918Forced ventilation, e.g. on heat dissipaters coupled to components the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels

Abstract

The present invention provides an electric power converter in which a tip portion of a cooling fin on an air flow inlet side is limited to flow a large quantity of air around a connection portion, where the fin efficiency is high, of a base surface of the cooling fin and the fin so that the cooling efficiency of the cooling fin can be improved. By providing the limiting member, air or atmosphere flowing into the cooling fin is directed to flow toward the fin near the base surface. Further, by providing the limiting member, an area of a portion from which the air or atmosphere flows into the cooling fin is also limited so that the velocity of the air or atmosphere flow becomes high. By these functions and the like, the cooling efficiency of the cooling fin can be increased as compared to the prior art.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an art of providing an electric power converter for supplying electric power to a motor, for example.

2. Description of Related Art

JP-A-6-38546 discloses cooling of an electric power converter (particularly see FIG. 1, and page 2). In JP-A-6-38546, by varying the length of a cooling fin at its circumferential part and at its inner part, it is intended to further improve cooling capability as compared to a conventional one. In the electric power converter, a conversion loss is generated in a diode bridge, and in a transistor module and an IGBT module which are inverse transforming elements, to generate heat. The heat generated due to the conversion loss is dissipated from the cooling fin by wind generated using a cooling fan so as not to thermally destroy semiconductors such as the diode and transistor. In general, it is said that silicon composing a semiconductor is destroyed when the temperature of the semiconductor becomes 150° C. or more, and therefore cooling is performed so that the temperature is equal to or below 150° C.

BRIEF SUMMARY OF THE INVENTION

As described also in the above prior art, in an electric power converter, it is necessary to attempt the dissipation and the cooling of the heat generated in its internal element or the like, and therefore various ideas and methods have been proposed.

In the electric power converter, as shown in FIG. 2, the electric power supplied from a commercial power source is input through terminals R, S, T, and converted into direct current in a diode three-phase bridge circuit 3. Thereafter, a capacitor 6 is used as a smoothing part for smoothing the direct current, and then the current is inversely transformed to perform frequency conversion by an inverter circuit 2 using a transistor module and an IGBT module which are switching elements.

In the electric power converter, a conversion loss is generated in the diode bridge and in the transistor module and the IGBT module which are inverse transforming elements, to generate heat. The heat is dissipated from a cooling fin by wind generated using a cooling fan so as not to thermally destroy semiconductors such as the diode and transistor.

Meanwhile, concerning the above described heat dissipation, the above semiconductor elements are placed on the cooling fin for air cooling, in general.

By performing this cooling efficiently, it is possible to attempt size reduction of a product.

Accordingly, it is generally preformed to enhance cooling efficiency of the cooling fin by forced air cooling of a fin portion by the fan.

Further, it is also possible to attempt the size reduction by changing the number of fins (blades) of the cooling fin, or varying space through which air flows.

Further, with respect to this cooling fin, it is also possible to promote the cooling by increasing its surface area and increasing the number of the fins of the cooling fin.

As described above, it has been broadly considered to improve the cooling efficiency by modifying the cooling fin. As a result, since the size and the performance of the product may be affected, these come into question when commercializing the electric power converter.

It is an object of the present invention to improve the cooling efficiency.

The present invention solves the above object in the following manner.

In a cooling fin of an electric power converter, in order to flow a large quantity of air around a connection portion of a base surface and a fin of the cooling fin at which connection portion the fin efficiency is high, a limiting member for limiting air or atmosphere flow is provided in a tip part of the fin which is opposite to the base surface, on a side from which air or atmosphere flows into the cooling fin.

By providing this limiting member, the air or atmosphere flowing into the cooling fin flows toward the fin near the base surface.

In addition, by providing the limiting member, an area of a portion from which air or atmosphere flows into the cooling fin is also limited so that the velocity of the air or atmosphere flow becomes high. With these functions and the like, the cooling efficiency of the cooling fin can be increased as compared to the prior art.

In addition, although the limiting member may be perpendicular to the base surface, by inclining the limiting member, a larger quantity of air or atmosphere flows toward or is directed to the base surface.

Further, in addition to the above described limiting member, a second limiting member may be provided on a side of the base surface, and on a side from which air or atmosphere flows into the cooling fin.

The above described configuration allows decrease in temperature of semiconductor elements and the like, not necessarily using a special cooling fin and fan. In this way, it is expected to achieve simplification and size reduction of the cooling fin of the electric power converter, for example.

According to the present invention described above, it is possible to provide an electric power converter with improved reliability as compared to the prior art.

Other objects, features and advantages of the invention will become apparent from the following description of the embodiments of the invention taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a structural view of an embodiment of the present invention;

FIG. 2 is an electric wiring diagram of an electric power converter;

FIG. 3 is a practical placement view of the electric power converter of the embodiment of the present invention;

FIG. 4 shows a simulation result according to the embodiment of the present invention;

FIG. 5 is a structural view of the embodiment of the present invention;

FIG. 6 shows a simulation result of the embodiment of the present invention;

FIG. 7 is another embodiment of the present invention;

FIG. 8 is a further embodiment of the present invention; and

FIG. 9 is a still further embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, a cooling structure according to the present invention will be described in detail with reference to embodiments shown in the drawing.

FIG. 1 illustrates one embodiment of an electric power converter according to the present invention. In this figure, reference numeral 1 denotes a cooling fin, reference numeral 2 denotes an IGBT module, reference numeral 3 denotes a diode module and reference numeral 4 denotes a limiting plate for limiting the flow of wind toward the fin. The limiting plate 4 is made by bending a lower side of a plate covering a bottom part (which is an opposite side to a base side) of the cooling fin.

FIG. 3 shows practical placement of a main circuit part of the electric power converter. Reference numeral 5 denotes a rush current prevention resistor, reference numeral 6 denotes a smoothing capacitor and reference numeral 7 denotes a cooling fan.

A loss generated in the IGBT module 2 and the diode module 3 thermally conducts to the cooling fin 1. A cooling fin part of the fin 1 is configured so that wind is drawn out by the cooling fan 7 for the purpose of forced air cooling. As a result, heat generated in the IGBT module 2 and the diode module 3 is dissipated here, into ambient atmosphere air.

It is generally known that the cooling fin 1 has high efficiency at a back side of a base surface la and at a portion of a fin 1 b close to the base surface 1 a, and the efficiency decreases toward a tip of the fin 1 b (on opposite side to the base surface 1 a).

In addition, when considering the cooling fin 1 as one stream tube for example, the mass of fluid flowing though each cross-sectional area S of the stream tube per unit time is the same as that of the other if the stream tube does not have a portion where air gushes out or is sucked into. Thus, the following Numerical Expression 1 is generally known as a continuity equation.
ρvS=constant   (Numerical Expression 1)
where v is a fluid velocity, and ρ is a fluid density.

Here, Numerical Expression 2 is derived from Numerical Expression 1 as follows.
v2=v1*(S1/S2)   (Numerical Expression 2)
where v1 is a fluid velocity in cross-sectional area S1, and v2 is a fluid velocity in cross-sectional area S2.

Numerical Expression 2 shows that the fluid velocity v2 increases as the cross-sectional area S2 decreases.

According to this, by providing the limiting plate 4 for limiting wind toward the fin 7 on a tip side of the fin 1 b to limit a flow passage area at an inlet in the fin tip part where the fin efficiency is low, the cross-sectional area corresponding to S2 in the above Numerical Expression 2 becomes decreased.

As a result, the wind velocity is increased in the base surface 1 a and in the portion of the fin 1 b close to the base surface 1 a which are not limited by the limiting plate 4 and have high cooling fin efficiency, and by increasing the quantity of wind flowing through these portions per unit time, the cooling can be promoted as compared to the prior art.

In connection with the above descried embodiment, FIG. 4 shows an analysis result based on simulation of flow of wind, wind velocity and the like in the case of providing the limiting plate 4. It can be seen from FIG. 4 that the wind velocity in the fin part near the base surface 1 a of the cooling fin 1 becomes high by providing the limiting plate 4.

In FIG. 4, arrows denote the wind flows, the direction of each arrow denotes the direction of the wind, and the length of each arrow denotes the velocity of the wind. Thus, a longer arrow denotes a higher velocity of the wind.

In FIG. 4, by providing the limiting plate 4, change in wind flow occurs in the circle parts indicated by A, B and C in the figure.

First, with regard to the circle part A, the wind flow from right becomes fast in the part along the base surface 1 a of the cooling fin 1. This is confirmed by the result that the arrows in the simulation in FIG. 4 are longer than those in the simulation in the case of not providing the limiting plate 4 (not shown).

It can be seen that, by the wind flow from right in the figure toward the fan on the left in the circle part A, the cooling efficiency in a portion along the base surface 1 a of the cooling fin 1 can be improved as compared to the prior art.

Next, also in the circle part B, the wind flow from right becomes fast. This is confirmed by the fact that the arrows are longer than those in the simulation in the case of not providing the limiting plate 4, as is in the circle part A.

It can be seen that, by the wind flow from right in the figure toward the fan on the left in the circle part B, the cooling efficiency in a middle portion of the cooling fin 1 can be improved as compared to the prior art.

On the other hand, in the circle part C, the wind direction changes in an irregular manner, rather than the wind flow from right in the figure toward the fan on the left. Therefore, it seems that the cooling efficiency becomes lower than that in the circle parts A and B.

In fact, it has been found also in simulation that a contribution ratio of the circle part C is lower than that of the circle parts A and B in terms of cooling of the cooling fin 1, even if the limiting plate 4 is not provided. Therefore, it is deemed that influence by providing the limiting plate 4 is small. Then, FIG. 6 shows a result obtained by simulation of change in temperature rise of the fin 1 when the length h of the limiting plate 4 in FIG. 5 is varied. In FIG. 5, reference character H denotes the length from a position at which a fin is attached to the base surface la of the cooling fin 1, to the tip of the fin, and the parameter of the horizontal axis in FIG. 6 is the ratio of the length h of the limiting plate 4 to the length H.

As can be seen from the result in FIG. 6, it has been determined in the simulation that, as the length h of the limiting plate 4 increases with respect to the fin length H, the effect of reducing the temperature rise is obtained accordingly.

Then, it can be understood from FIG. 6 that the effect of reducing the temperature rise is largest when h/H is about 80%.

It is expected from the result in FIG. 6 that the effect appears and becomes larger until the length h reaches up to 80% of the fin length H.

Although a large cooling efficiency is obtained at 80% in FIG. 6, it is conceivable that the ratio is made smaller than 80% in consideration of deposition and clogging of foreign matters to the cooling fin, etc. The ratio lower than 80% is expected to be preferable, also from the viewpoint of reducing generation and magnitude of wind sound when sucking air or atmosphere on a sucking side (an opposite side to the fan) of the cooling fin 1.

Again, as already described in connection with the circle part C in FIG. 4 and thus is repeat, it is found in the simulation and an actual confirmation based on the simulation that the limited portion has a low contribution ratio for cooling of the cooling fin when the length h of the limiting plate 4 is about 30%. Therefore, it is expected that problems are small with respect to the influence upon the cooling efficiency of the entire cooling fin and the like even if the length h of the limiting plate 4 is set and implemented in the order of 30%, because the above described portion in the order of 30% inherently has a small contribution ratio for cooling.

In addition, it can be said that implementation in the order of 30% to 60% is preferable in consideration of the above described deposition and clogging of foreign matters to the cooling fin, etc. In such a range, generation and magnitude of wind sound when sucking air or atmosphere on the sucking side of the cooling fin 1 can be reduced to an insignificant level.

It was also confirmed with an actual prototype that good cooling effect can be obtained at about 35% as compared to the prior art, and wind sound when sucking is insignificant, etc.

Next, FIG. 7 shows another embodiment according to the present invention.

In FIG. 7, the limiting plate 4 is provided in an inclined manner. The configuration as in FIG. 7 aims to direct the wind flow toward the fin portion near the base surface 1 a of the cooling fin 1 so as to further increase the wind velocity.

Further, FIG. 8 shows still further embodiment according to the present invention.

In FIG. 8, a limiting plate 8 for limiting wind flow is also provided on a side of the base surface 1 a of the cooling fin 1.

Providing the limiting plate 8 aims to cause change in wind flow in order to improve the cooling efficiency of the fin near the base surface 1 a of the cooling fin 1. Here, change in wind flow means turbulent flow which is said as flow in which small parts of fluid are irregularly mixed to include turbulence, irregular flow or the like.

The above described limiting plate 4 may be provided by bending a part of a housing which supports the cooling fin 1 and the like. In this way, another step of attaching the limiting plate 4 or the like may be eliminated and it is also possible to achieve reduction in the number of parts.

FIG. 9 shows an embodiment in which the limiting plate 4 is provided by bending. Further, a portion in the middle of the limiting plate 4 is not bended with the aim of keeping the strength of the housing part to a certain extent. Although the limiting plate 4 is absent in the portion which has not been bended, it is deemed that there is no problem thereby because its influence upon the cooling efficiency can be small.

Embodiments of the present invention are not limited to the above described embodiments and those may be modified as appropriate. For example, instead of providing the limiting plate 4 in a bended manner as in FIG. 9, the limiting plate 4 may be provided in such a way that the limiting plate 4 is supported by the housing part.

It should be further understood by those skilled in the art that although the foregoing description has been made on embodiments of the invention, the invention is not limited thereto and various changes and modifications may be made without departing from the spirit of the invention and the scope of the appended claims.

Claims (7)

1. An electric power converter comprising:
a rectifying part for converting supplied alternating current power into direct current power;
a smoothing part for smoothing output from the rectifying part;
an inverse transforming part for converting output from the smoothing part into alternating current power;
a controlling part for controlling the inverse transforming part;
a cooling part for cooling heat generated at least in the inverse transforming part, the cooling part comprising a fin for dissipating heat and a base surface on which the fin is supported; and
a housing for supporting the rectifying part, the smoothing part, the inverse transforming part, the controlling part and the cooling part, wherein
an atmosphere limiting part for changing flow of atmosphere flowing in the cooling part is provided at an opening portion of the fin on an opposite side to the base surface of the cooling part.
2. The electric power converter according to claim 1, wherein the length of the fin and the length of the atmosphere limiting part have the following relationship:

0<=h/H<=0.8.
3. The electric power converter according to claim 1, wherein a second atmosphere limiting part is also provided on a side of the base surface.
4. The electric power converter according to claim 1, wherein the atmosphere limiting part is provided with an inclined part which inclines toward the base surface.
5. The electric power converter according to claim 1, wherein the atmosphere limiting part is provided by bending a part of the housing.
6. The electric power converter according to claim 5, wherein the atmosphere limiting part comprises a portion where a part of the housing is not bended.
7. The electric power converter according to claim 5, wherein a generally middle portion of the part of the housing which forms the atmosphere limiting part is not bended.
US11/642,717 2006-05-31 2006-12-21 Electric power converter Active 2027-08-01 US7515422B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2006150874A JP4848209B2 (en) 2006-05-31 2006-05-31 Power converter
JP2006-150874 2006-05-31

Publications (2)

Publication Number Publication Date
US20070279864A1 US20070279864A1 (en) 2007-12-06
US7515422B2 true US7515422B2 (en) 2009-04-07

Family

ID=38650637

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/642,717 Active 2027-08-01 US7515422B2 (en) 2006-05-31 2006-12-21 Electric power converter

Country Status (4)

Country Link
US (1) US7515422B2 (en)
JP (1) JP4848209B2 (en)
CN (1) CN100588104C (en)
DE (1) DE102006060046A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100079944A1 (en) * 2008-09-26 2010-04-01 Rockwell Automation Technologies, Inc. Power electronic module cooling system and method
US20100321889A1 (en) * 2009-06-18 2010-12-23 Honda Motor Co., Ltd. Power conversion device
US20120262884A1 (en) * 2011-04-14 2012-10-18 Alstom Technology Ltd Power converter arrangement and method for operating a power converter arrangement
US20130114206A1 (en) * 2010-05-12 2013-05-09 Dirk Schramm Power electronic arrangement
US20130258602A1 (en) * 2010-12-28 2013-10-03 Mitsubishi Electric Corporation Power conversion apparatus
US20140301041A1 (en) * 2011-11-30 2014-10-09 Mitsubishi Electric Corporation Forced air cooling-type power conversion device
US20150036292A1 (en) * 2013-08-01 2015-02-05 Lear Corporation Electrical Device for Use in an Automotive Vehicle and Method for Cooling Same

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1915047A3 (en) * 2006-10-16 2009-07-29 Projects Unlimited, Inc. Static inverter with housing for hardened environmental conditions
EP2099121B1 (en) * 2008-03-04 2017-10-18 Kabushiki Kaisha Toyota Jidoshokki Power converter apparatus
DE102008054835A1 (en) * 2008-12-17 2010-07-01 BSH Bosch und Siemens Hausgeräte GmbH Laundry dryer has temperature heat sink system with two fluid streams, where temperature heat sink system guides part of waste heat of control unit
EP2299793B1 (en) * 2009-09-18 2011-11-09 SMA Solar Technology AG Inverter with a casing
CN102158059A (en) * 2011-05-19 2011-08-17 台安科技(无锡)有限公司 Miniaturized frequency converter with high power
JP5862838B2 (en) * 2013-10-17 2016-02-16 三菱電機株式会社 Power unit and power converter
JP6161127B2 (en) * 2014-12-03 2017-07-12 オムロンオートモーティブエレクトロニクス株式会社 Power converter
CN106314249B (en) * 2016-08-27 2019-02-26 赣州恒玖电气有限公司 A kind of electronic logistic car of band exchange emergency power supply

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03256562A (en) 1990-03-03 1991-11-15 Fuji Electric Co Ltd Cooling unit for inverter
US5170336A (en) * 1990-03-05 1992-12-08 Dimensions Unlimited, Inc. DC to AC inverter with improved forced air cooling method and apparatus
JPH0638546A (en) 1992-07-13 1994-02-10 Hitachi Ltd Forcedly-air-cooled inverter apparatus
EP0693820A1 (en) 1994-07-20 1996-01-24 Hitachi, Ltd. Electric power conversion device for alternating current electric car
US5497289A (en) * 1992-09-30 1996-03-05 Mitsubishi Denki Kabushiki Kaisha Inverter apparatus and method therefor
US6700802B2 (en) * 2000-02-14 2004-03-02 Aura Systems, Inc. Bi-directional power supply circuit
EP1503617A2 (en) 2003-07-28 2005-02-02 Hitachi Industrial Equipment Systems Co. Ltd. Frequency converter
US6972972B2 (en) * 2002-04-15 2005-12-06 Airak, Inc. Power inverter with optical isolation
JP2005348533A (en) 2004-06-03 2005-12-15 Fuji Electric Fa Components & Systems Co Ltd Inverter
US6992409B2 (en) * 2002-03-15 2006-01-31 Denso Corporation Liquid-cooled rotary electric machine integrated with an inverter
US7400070B2 (en) * 2005-08-11 2008-07-15 Mitsubishi Electric Corp. Rotating electric machine for vehicles

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003198170A (en) * 2001-12-27 2003-07-11 Matsushita Electric Ind Co Ltd Cooler
JP2003259658A (en) * 2002-03-06 2003-09-12 Fuji Electric Co Ltd Power converter
JP2003338595A (en) * 2002-03-11 2003-11-28 Matsushita Electric Ind Co Ltd Cooling device for electronic component
JP2004221103A (en) * 2003-01-09 2004-08-05 Matsushita Electric Ind Co Ltd Cooling device of electronic component
JP2005064070A (en) * 2003-08-19 2005-03-10 Hitachi Kokusai Electric Inc Electronic apparatus

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03256562A (en) 1990-03-03 1991-11-15 Fuji Electric Co Ltd Cooling unit for inverter
US5170336A (en) * 1990-03-05 1992-12-08 Dimensions Unlimited, Inc. DC to AC inverter with improved forced air cooling method and apparatus
JPH0638546A (en) 1992-07-13 1994-02-10 Hitachi Ltd Forcedly-air-cooled inverter apparatus
US5497289A (en) * 1992-09-30 1996-03-05 Mitsubishi Denki Kabushiki Kaisha Inverter apparatus and method therefor
EP0693820A1 (en) 1994-07-20 1996-01-24 Hitachi, Ltd. Electric power conversion device for alternating current electric car
US6700802B2 (en) * 2000-02-14 2004-03-02 Aura Systems, Inc. Bi-directional power supply circuit
US6992409B2 (en) * 2002-03-15 2006-01-31 Denso Corporation Liquid-cooled rotary electric machine integrated with an inverter
US6972972B2 (en) * 2002-04-15 2005-12-06 Airak, Inc. Power inverter with optical isolation
EP1503617A2 (en) 2003-07-28 2005-02-02 Hitachi Industrial Equipment Systems Co. Ltd. Frequency converter
CN1578076A (en) 2003-07-28 2005-02-09 日立工业设备系统株式会社 Frequency converter
JP2005348533A (en) 2004-06-03 2005-12-15 Fuji Electric Fa Components & Systems Co Ltd Inverter
US7400070B2 (en) * 2005-08-11 2008-07-15 Mitsubishi Electric Corp. Rotating electric machine for vehicles

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100079944A1 (en) * 2008-09-26 2010-04-01 Rockwell Automation Technologies, Inc. Power electronic module cooling system and method
US9192079B2 (en) * 2008-09-26 2015-11-17 Rockwell Automation Technologies, Inc. Power electronic module cooling system and method
US20100321889A1 (en) * 2009-06-18 2010-12-23 Honda Motor Co., Ltd. Power conversion device
US8169780B2 (en) * 2009-06-18 2012-05-01 Honda Motor Co., Ltd. Power conversion device
US20130114206A1 (en) * 2010-05-12 2013-05-09 Dirk Schramm Power electronic arrangement
US20130258602A1 (en) * 2010-12-28 2013-10-03 Mitsubishi Electric Corporation Power conversion apparatus
US8670237B2 (en) * 2010-12-28 2014-03-11 Mitsubishi Electric Corporation Power conversion apparatus
US20120262884A1 (en) * 2011-04-14 2012-10-18 Alstom Technology Ltd Power converter arrangement and method for operating a power converter arrangement
US8964387B2 (en) * 2011-04-14 2015-02-24 Alstom Technology Ltd. Power converter arrangement and method for operating a power converter arrangement
US20140301041A1 (en) * 2011-11-30 2014-10-09 Mitsubishi Electric Corporation Forced air cooling-type power conversion device
US9240750B2 (en) * 2011-11-30 2016-01-19 Mitsubishi Electric Corporation Forced air cooling-type power conversion device
US20150036292A1 (en) * 2013-08-01 2015-02-05 Lear Corporation Electrical Device for Use in an Automotive Vehicle and Method for Cooling Same

Also Published As

Publication number Publication date
CN100588104C (en) 2010-02-03
DE102006060046A1 (en) 2007-12-06
CN101083439A (en) 2007-12-05
JP4848209B2 (en) 2011-12-28
US20070279864A1 (en) 2007-12-06
JP2007325374A (en) 2007-12-13

Similar Documents

Publication Publication Date Title
US7719836B2 (en) Cooling fan module
US5781411A (en) Heat sink utilizing the chimney effect
US9801306B2 (en) Heat sink for power circuits
US7193849B2 (en) Heat dissipating device
US6978827B2 (en) Active heat sink
US7180740B2 (en) Method and apparatus for side-type heat dissipation
KR100530435B1 (en) Electric machine, preferably a three-phase generator with rectifier unit
CN100340052C (en) Frequency converter
JP3095801U (en) Articulated frame for fans
US6736192B2 (en) CPU cooler
US7978488B2 (en) Three-level power converting apparatus
JP3096729U (en) CPU cooling device with thermal pipe
JP5928233B2 (en) Radiator and electronic device provided with the radiator
US6498395B2 (en) Heat sink with cooling fins for semiconductor package
US20180007815A1 (en) Power module
US6166904A (en) Heat generating element cooling device
US8081465B2 (en) Cooling apparatus for semiconductor chips
JP4155234B2 (en) Arc welding control device
US6011216A (en) Heat-generating element cooling device
JP2006063978A (en) Heat dispersion fan
KR101077803B1 (en) Semiconductor device
US7289325B2 (en) Power converter cooling
US20080144279A1 (en) Heat sink
US20050045308A1 (en) Planar heat pipe structure
US6631756B1 (en) High performance passive cooling device with ducting

Legal Events

Date Code Title Description
AS Assignment

Owner name: HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO. LTD., JAP

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HIROTA, MASAYUKI;IBORI, SATOSHI;KAMEZAWA, TOMOYA;AND OTHERS;REEL/FRAME:019070/0037;SIGNING DATES FROM 20061222 TO 20061223

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8